CAILLOUET , Christelle

This paper presents a model for the packet delivery rate of LoRaWAN frames in presence of receive antenna diversity. Based on this model we study the the redundancy level between the transmission so as to reach a reliable data delivery rate without overloading the channel. We show that the combination of antenna diversity with a properly chosen...

Anytime and anywhere network access can be provided by Unmanned Aerial Vehicles (UAV) with air-to-ground and air-to-air communications using directional antennas for targets located on the ground. Deploying these Unmanned Aerial Vehicles to cover targets is a complex problem since each target should be covered, while minimizing (i) the...

Dans cet article, nous étudions le problème joint du routage et de l'ordonnancement dans les réseaux radio maillés où la demande des utilisateurs est incertaine. Nous présentons un modèle d'optimisation robuste basé sur le prix de la robustesse qui permet d'ajuster le niveau de conservatisme de la solution robuste.

Wireless Mesh Networks have attracted attention because of the advantages of these broadband access networks. The Round Weighting Problem has been addressed as an effective relaxation of the joint routing and scheduling in the case of steady state operating networks. We propose a new robust model considering traffic demand uncertainty,...

International audience

Dans cet article, nous étudions le problème de couverture de cibles au sol par des drones. Le but est de minimiser le nombre de drones déployés et de maximiser la qualité des communications radio afin de collecter efficacement l'information des cibles au sol jusqu'à une station de base centrale. Nous modélisons ce problème à l'aide d'un...

This paper considers a LoRaWAN cell in which devices access the channel using the unslotted ALOHA protocol. We propose a model of this access method that combines the effects of collisions with channel fading, by which reception may get buried in noise. Unlike the existing models of LoRaWAN, our model takes into account the frame arrival...

International audience

In this paper, we tackle the optimal energy replenishment problem (OERP) using a given number of flying drones, in order to efficiently recharge wireless sensor nodes. We present a linear program that maximizes the amount of harvested energy to the sensors. We show that the model is solved to optimality in a few seconds for sensor networks with...

Data collection is an important mechanism for wireless sensor networks to be viable. This paper addresses the Aerial Data Collection Problem (ADCP) from a set of mobile wireless sensors located on the ground, using a fleet of flying devices. The objective is i) to deploy a set of Unmanned Aerial Vehicles (UAVs) in a 3D space to cover and...

Les technologies des réseaux radio à micro-ondes sont une alternative viable pour apporter l'internet à haut débit dans les "zones blanches'', ainsi que pour le déploiement de réseaux de collectivités territoriales en zones urbaines. Ces réseaux utilisent des liens radios directionnels pour transporter des informations à haut débit sur de...

This paper explores the capacity limits and the tradeoff between the antagonistic means of enabling reliable data delivery in a loaded LoRaWAN cell. In fact, channel attenuation and variability call for robust transmission settings but the associated load increase causes more collisions between frames. In addition to the physical layer...

In this work, we address the optimization problem of covering a set of mobile sensors with a fleet of flying devices. The goal is to deploy a connected set of Unmanned Aerial Vehicles (UAVs) continuously monitoring the mobile sensors and reporting information to a fixed base station for efficient data collection. We propose an effective...

Providing network services access anytime and anywhere is nowadays a critical issue, especially in disaster emergency situations. A natural response to such a need is the use of autonomous flying drones to help finding survivors and provide network connectivity to the rescue teams. We propose VESPA, a distributed algorithm using only one-hop...

This paper presents a model of Aloha access in LoRaWAN which takes into account the timing of packet arrivals. We draw 3 observations regarding the packet reception ratio. First, repeating is all but always beneficial, even though it increases the load; next, using a spreading factor lower than SF7 sometimes allows to increase the coverage...

Fournir un accès à des services réseau à tout moment et en tout lieu est aujourd'hui une question cruciale, en particulier dans les situations d'urgence en cas de catastrophe. Une réponse naturelle à un tel besoin est l'utilisation de drones volants autonomes pour aider à découvrir les survivants et fournir une connectivité réseau aux équipes...

Dans cette article, nous présentons un modèle d'optimisation pour le problème de couverture de capteurs mobiles par des drones. Le but est de déployer des drones de manière à collecter efficacement des données depuis des capteurs mobiles vers une station de base au cours du temps. Nous proposons un modèle se résolvant par génération de...

The use of autonomous unmanned aerial vehicles (UAVs) or drones has emerged to efficiently collect data from mobile sensors when there is no infrastructure available. The drones can form a flying ad-hoc network through which the sensors can send their data to a base station at any time. In this paper, we present a mixed integer linear program...

In this paper, we consider the problem of sharing the infrastructure of a backhaul network, called fixed broadband wireless network using microwave links, for routing. We investigate in particular on the revenue maximization problem for the physical network operator (PNO) when subject to stochastic traffic requirements of multiple virtual...

The use of drones has become more widespread in recent years. Many use cases have developed involving these autonomous vehicles, ranging from simple delivery of packages to complex emergency situations following catastrophic events. The miniaturization and very low cost of these machines make it possible today to create large meshes to ensure...

In this paper, we address the problem of bandwidth allocation and routing in wireless networks. A first model of this problem is known as the Round Weighting Problem (RWP) in which a weight is assigned to the set of rounds, i.e. a set of pairwise non-interfering links. We present a new formulation that forgets about the routing and concentrate...

International audience

In this paper, we address the problem of computing the transport capacity of Wireless Mesh Networks (WMNs) dedicated to Internet access. Routing and transmission scheduling have a major impact on the capacity provided to the clients. A cross-layer optimization of these problems allows the routing to take into account contentions due to radio...

In this paper, we consider the problem of sharing the infrastructure of a backhaul network, called fixed broadband wireless network using microwave links, for routing. We investigate in particular on the revenue maximization problem for the physical network operator (PNO) when subject to stochastic traffic requirements of multiple virtual...

Dans cet article nous présentons un modèle en programmation linéaire permettant de déployer un réseau aérien à moindre coût pour la collecte de données de capteurs mobiles. Nous utilisons un modèle énergétique réaliste afin d'étudier le compromis entre distance parcourue et énergie dépensée. Ce modèle montre que l'état stationnaire d'un drone...